Abstract
Abstract Friction welding is a solid-state joining process which is applied extensively because of its advantages such as low heat input, efficient application, ease in manufacturing, and environmental friendliness. The present study investigates the mechanical and metallurgical properties of UNS S32205 duplex stainless steel friction-welded joints. The process parameters, namely friction pressure, upsetting pressure, and rotational speed are individually varied from low level to high level (within the range of the machine setup) and their effects on the joint properties are analyzed. The partial-deformation zone had higher hardness than the weld and base metal. The toughness of the joints was evaluated at room temperature and at subzero temperature conditions. The impact toughness of the friction-welded joints was found to be superior to fusion-joined duplex stainless steel in room and cryogenic conditions.
Highlights
Duplex stainless steel (DSS) has a two-phase structure of ferrite and austenite, and gets the beneficial effects of both phases: high strength and toughness even at low temperatures
The typical cross-sectional views of the friction-welded samples are presented in Fig. 2 and they revealed no defects in the joint zone
The volume of ferrite fraction content was much higher than that of the austenite content in the weld and this could result in the loss of lowtemperature notch toughness and corrosion resistance in the weld [19]
Summary
Duplex stainless steel (DSS) has a two-phase structure of ferrite and austenite, and gets the beneficial effects of both phases: high strength (from the ferrite) and toughness (from the austenite) even at low temperatures. Higher ferrite content and coarse grains were the other factors that decreased both the corrosion resistance and the mechanical properties of welded joints [12] during the solidification in welds of a DSS with (Cr/Ni)eq = 1.8 at various cooling rates [13]. Atomic diffusion took place at the bond interface to enhance the microstructural strength aspects, which increased beyond that of the base materials. Theoretical and experimental analyses of atom diffusion characteristics were performed on wire-bonding interfaces, on a die with Al-pad in the T/S-2100 ultrasonic wire bonder. Within several tens of milliseconds, the thickness of atom diffusion in the ultrasonic bonding interface was approximately 100–300 nm for the given bonding parameters, which formed good bonding strength [18]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
